The largest ever catalogue of X-ray sources has been released by the team behind the XMM-Newton observatory. The newly released data-set contains more than a quarter of a million entries.
Professor Mike Watson, the XMM-Newton Survey Science principal investigator from the University of Leicester, explains: "The 2XMM catalogue is the largest compilation of X-ray-emitting objects ever made, containing nearly a quarter of a million entries. This has been possible because of the longevity of the XMM-Newton mission and the highly sensitive instruments onboard the satellite."
More: http://www.theregister.co.uk/2007/09/10/xmm_catalogue/